CVE-2026-39911 Vulnerability Analysis & Exploit Details

CVE-2026-39911
Vulnerability Scoring

8.8

/10

Severe Risk

Cybersecurity professionals consider CVE-2026-39911 an immediate threat requiring urgent mitigation.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-39911 Details

Status: Modified

Last updated: 🕔 01 May 2026, 17:16 UTC
Originally published on: 🕕 09 Apr 2026, 18:17 UTC

Time between publication and last update: 21 days

CVSS Release: version 3

CVSS3 Source

disclosure@vulncheck.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE-2026-39911 Vulnerability Summary

CVE-2026-39911: Hashgraph Guardian through version 3.5.1, fixed in commit 45fbe2f, contains an unsandboxed JavaScript execution vulnerability in the Custom Logic policy block worker that allows authenticated Standard Registry users to execute arbitrary code by passing user-supplied JavaScript expressions directly to the Node.js Function() constructor without isolation. Attackers can import native Node.js modules to read arbitrary files from the container filesystem, access process environment variables containing sensitive credentials such as RSA private keys, JWT signing keys, and API tokens, and forge valid authentication tokens for any user including administrators.

Assessing the Risk of CVE-2026-39911

Access Complexity Graph

The exploitability of CVE-2026-39911 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-39911

CVE-2026-39911 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-39911, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-39911, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: High
Exploiting CVE-2026-39911 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2026-39911 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2026-39911 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-39911 References

External References

CWE Common Weakness Enumeration

CWE-668

Vulnerable Configurations

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cpe:2.3:a:hedera:guardian:1.0.0:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:1.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.0:develop:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.0:develop:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.0:release:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.0:release:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.5:-:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.0.5:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:1.0.5:develop:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:1.1.0:*:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:1.2.0:develop:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.1.3:*:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.3.1:*:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.4.0:*:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.4.2:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:2.5.0:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.5.0:prerelease:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.8.0:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.9.0:-:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:2.9.0:prerelease:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.15:-:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:2.15:-:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:2.15:prerelease:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:2.15:prerelease:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.16.0:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.17.0:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.17.0:prerelease:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.18.0:-:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:2.20.0:prerelease:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:2.20.0:prerelease:*:*:*:*:*:*
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cpe:2.3:a:hedera:guardian:3.4.1:*:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:3.5.0:-:*:*:*:*:*:*
cpe:2.3:a:hedera:guardian:3.5.0:-:*:*:*:*:*:*

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